Sainsburys ingredients: Water, Tomato Purée (29%), Sugar, Spirit Vinegar, Maize Starch, Salt, Spice Blend (Salt, Tomato Powder, Clove Extract), Clove Leaf Oil.
Heinz ingredients: Tomatoes (148g per 100g Tomato Ketchup), Spirit Vinegar, Sugar, Salt, Spice and Herb Extracts (contain Celery), Spice
neither of them contain synthetic ingredients.